[PATCH] ntdll: Fixup instruction pointer for EXCEPTION_BREAKPOINT in the unix part on x86/x86_64.
Paul Gofman
pgofman at codeweavers.com
Thu Jul 9 10:36:52 CDT 2020
Signed-off-by: Paul Gofman <pgofman at codeweavers.com>
---
dlls/ntdll/signal_i386.c | 3 --
dlls/ntdll/signal_x86_64.c | 3 --
dlls/ntdll/tests/exception.c | 53 ++++++++++++++++++++++++++-------
dlls/ntdll/unix/signal_i386.c | 14 ++++++++-
dlls/ntdll/unix/signal_x86_64.c | 13 ++++++++
5 files changed, 68 insertions(+), 18 deletions(-)
diff --git a/dlls/ntdll/signal_i386.c b/dlls/ntdll/signal_i386.c
index 5e0c0bd0907..a130638cb31 100644
--- a/dlls/ntdll/signal_i386.c
+++ b/dlls/ntdll/signal_i386.c
@@ -230,9 +230,6 @@ NTSTATUS WINAPI dispatch_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
context->SegEs, context->SegFs, context->SegGs, context->EFlags );
}
- /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
- if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;
-
if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
NtContinue( context, FALSE );
diff --git a/dlls/ntdll/signal_x86_64.c b/dlls/ntdll/signal_x86_64.c
index c7c8b964056..57f9aee8105 100644
--- a/dlls/ntdll/signal_x86_64.c
+++ b/dlls/ntdll/signal_x86_64.c
@@ -564,9 +564,6 @@ NTSTATUS WINAPI dispatch_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
context->R12, context->R13, context->R14, context->R15 );
}
- /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
- if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Rip--;
-
if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
NtContinue( context, FALSE );
diff --git a/dlls/ntdll/tests/exception.c b/dlls/ntdll/tests/exception.c
index bf8ccf03053..5de885aadf2 100644
--- a/dlls/ntdll/tests/exception.c
+++ b/dlls/ntdll/tests/exception.c
@@ -1673,6 +1673,9 @@ static DWORD dbg_except_continue_handler(EXCEPTION_RECORD *rec, EXCEPTION_REGIST
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher)
{
ok(hook_called, "Hook was not called.\n");
+
+ ok(rec->ExceptionCode == 0x80000003, "Got unexpected ExceptionCode %#x.\n", rec->ExceptionCode);
+
got_exception = 1;
dbg_except_continue_handler_eip = (void *)context->Eip;
++context->Eip;
@@ -1684,11 +1687,22 @@ static LONG WINAPI dbg_except_continue_vectored_handler(struct _EXCEPTION_POINTE
EXCEPTION_RECORD *rec = e->ExceptionRecord;
CONTEXT *context = e->ContextRecord;
- trace("dbg_except_continue_vectored_handler, code %#x, eip %#x.\n", rec->ExceptionCode, context->Eip);
+ trace("dbg_except_continue_vectored_handler, code %#x, eip %#x, ExceptionAddress %p.\n",
+ rec->ExceptionCode, context->Eip, rec->ExceptionAddress);
+
+ ok(rec->ExceptionCode == 0x80000003, "Got unexpected ExceptionCode %#x.\n", rec->ExceptionCode);
got_exception = 1;
- ++context->Eip;
+ if ((ULONG_PTR)rec->ExceptionAddress == context->Eip + 1)
+ {
+ /* XP and Vista+ have ExceptionAddress == Eip + 1, Eip is adjusted even
+ * for software raised breakpoint exception.
+ * Win2003 has Eip not adjusted and matching ExceptionAddress.
+ * Win2008 has Eip not adjuated and ExceptionAddress not filled for
+ * software raised exception. */
+ context->Eip = (ULONG_PTR)rec->ExceptionAddress;
+ }
return EXCEPTION_CONTINUE_EXECUTION;
}
@@ -1777,7 +1791,7 @@ static void test_kiuserexceptiondispatcher(void)
ok(hook_exception_address == code_mem || broken(!hook_exception_address) /* Win2008 */,
"Got unexpected exception address %p, expected %p.\n",
hook_exception_address, code_mem);
- todo_wine ok(hook_KiUserExceptionDispatcher_eip == code_mem, "Got unexpected exception address %p, expected %p.\n",
+ ok(hook_KiUserExceptionDispatcher_eip == code_mem, "Got unexpected exception address %p, expected %p.\n",
hook_KiUserExceptionDispatcher_eip, code_mem);
ok(dbg_except_continue_handler_eip == code_mem, "Got unexpected exception address %p, expected %p.\n",
dbg_except_continue_handler_eip, code_mem);
@@ -1798,7 +1812,7 @@ static void test_kiuserexceptiondispatcher(void)
pRtlRaiseException(&record);
ok(got_exception, "Handler was not called.\n");
- ok(hook_called, "Hook was not called.\n");
+ ok(hook_called || broken(!hook_called) /* 2003 */, "Hook was not called.\n");
RemoveVectoredExceptionHandler(dbg_except_continue_vectored_handler);
ret = VirtualProtect(pKiUserExceptionDispatcher, sizeof(saved_KiUserExceptionDispatcher_bytes),
@@ -2834,13 +2848,13 @@ static LONG WINAPI dbg_except_continue_vectored_handler(struct _EXCEPTION_POINTE
trace("dbg_except_continue_vectored_handler, code %#x, Rip %#lx.\n", rec->ExceptionCode, context->Rip);
+ ok(rec->ExceptionCode == 0x80000003, "Got unexpected exception code %#x.\n", rec->ExceptionCode);
+
got_exception = 1;
- if (NtCurrentTeb()->Peb->BeingDebugged || !strcmp( winetest_platform, "wine" ))
- {
- todo_wine_if(!NtCurrentTeb()->Peb->BeingDebugged)
- ok(NtCurrentTeb()->Peb->BeingDebugged, "context->Rip misplaced for dbg breakpoint exception.\n");
+ dbg_except_continue_handler_rip = (void *)context->Rip;
+ if (NtCurrentTeb()->Peb->BeingDebugged)
++context->Rip;
- }
+
return EXCEPTION_CONTINUE_EXECUTION;
}
@@ -2936,7 +2950,7 @@ static void test_kiuserexceptiondispatcher(void)
ok(hook_exception_address == code_mem || broken(!hook_exception_address) /* Win2008 */,
"Got unexpected exception address %p, expected %p.\n",
hook_exception_address, code_mem);
- todo_wine ok(hook_KiUserExceptionDispatcher_rip == code_mem, "Got unexpected exception address %p, expected %p.\n",
+ ok(hook_KiUserExceptionDispatcher_rip == code_mem, "Got unexpected exception address %p, expected %p.\n",
hook_KiUserExceptionDispatcher_rip, code_mem);
ok(dbg_except_continue_handler_rip == code_mem, "Got unexpected exception address %p, expected %p.\n",
dbg_except_continue_handler_rip, code_mem);
@@ -2971,10 +2985,27 @@ static void test_kiuserexceptiondispatcher(void)
ok(got_exception, "Handler was not called.\n");
ok(hook_called, "Hook was not called.\n");
- NtCurrentTeb()->Peb->BeingDebugged = 0;
+ ok(hook_exception_address == (BYTE *)hook_KiUserExceptionDispatcher_rip + 1
+ || broken(!hook_exception_address) /* 2008 */, "Got unexpected addresses %p, %p.\n",
+ hook_KiUserExceptionDispatcher_rip, hook_exception_address);
RemoveVectoredExceptionHandler(dbg_except_continue_vectored_handler);
+ memcpy(pKiUserExceptionDispatcher, patched_KiUserExceptionDispatcher_bytes,
+ sizeof(patched_KiUserExceptionDispatcher_bytes));
+ got_exception = 0;
+ hook_called = FALSE;
+ run_exception_test(dbg_except_continue_handler, NULL, except_code, ARRAY_SIZE(except_code), PAGE_EXECUTE_READ);
+
+ ok(got_exception, "Handler was not called.\n");
+ ok(hook_called, "Hook was not called.\n");
+ ok(hook_KiUserExceptionDispatcher_rip == code_mem, "Got unexpected exception address %p, expected %p.\n",
+ hook_KiUserExceptionDispatcher_rip, code_mem);
+ ok(dbg_except_continue_handler_rip == code_mem, "Got unexpected exception address %p, expected %p.\n",
+ dbg_except_continue_handler_rip, code_mem);
+
+ NtCurrentTeb()->Peb->BeingDebugged = 0;
+
ret = VirtualProtect(pKiUserExceptionDispatcher, sizeof(saved_KiUserExceptionDispatcher_bytes),
old_protect2, &old_protect2);
ok(ret, "Got unexpected ret %#x, GetLastError() %u.\n", ret, GetLastError());
diff --git a/dlls/ntdll/unix/signal_i386.c b/dlls/ntdll/unix/signal_i386.c
index 1e0774e84da..cafaaa0ea55 100644
--- a/dlls/ntdll/unix/signal_i386.c
+++ b/dlls/ntdll/unix/signal_i386.c
@@ -1584,11 +1584,23 @@ static void setup_raise_exception( ucontext_t *sigcontext, struct stack_layout *
SS_sig(sigcontext) = get_ds();
stack->rec_ptr = &stack->rec; /* arguments for KiUserExceptionDispatcher */
stack->context_ptr = &stack->context;
+
+ if (stack->rec.ExceptionCode == EXCEPTION_BREAKPOINT)
+ {
+ /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
+ stack->context.Eip--;
+ }
}
__ASM_GLOBAL_FUNC( call_user_exception_dispatcher,
"add $4,%esp\n\t"
- "jmp *8(%esp)")
+ "movl (%esp),%eax\n\t" /* rec */
+ "movl (%eax),%eax\n\t" /* ExceptionCode */
+ "cmpl $0x80000003,%eax\n\t"
+ "jne 1f\n\t"
+ "movl 4(%esp),%eax\n\t" /* context */
+ "decl 0xb8(%eax)\n\t" /* Eip */
+ "1:\tjmp *8(%esp)")
/**********************************************************************
* get_fpu_code
diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c
index 6e103a78fb5..eed622851f0 100644
--- a/dlls/ntdll/unix/signal_x86_64.c
+++ b/dlls/ntdll/unix/signal_x86_64.c
@@ -1958,6 +1958,12 @@ static void setup_raise_exception( ucontext_t *sigcontext, struct stack_layout *
return;
}
+ if (stack->rec.ExceptionCode == EXCEPTION_BREAKPOINT)
+ {
+ /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
+ stack->context.Rip--;
+ }
+
/* now modify the sigcontext to return to the raise function */
RIP_sig(sigcontext) = (ULONG_PTR)raise_func_trampoline;
R8_sig(sigcontext) = (ULONG_PTR)pKiUserExceptionDispatcher;
@@ -1983,6 +1989,13 @@ void WINAPI do_call_user_exception_dispatcher( EXCEPTION_RECORD *rec, CONTEXT *c
{
memmove(&stack->context, context, sizeof(*context));
memcpy(&stack->rec, rec, sizeof(*rec));
+
+ if (stack->rec.ExceptionCode == EXCEPTION_BREAKPOINT)
+ {
+ /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
+ stack->context.Rip--;
+ }
+
user_exception_dispatcher_trampoline( stack, dispatcher );
}
--
2.26.2
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